Model 2 Building having Waffle Slab

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Model 3 Building having Ribbed Slab

Seismic Response of Large span slab in Horizontal Setback Building

Manish Kumar Pandey

1, Dr. Raghvendra Singh2 1P.G. Scholar, 2Professor, Civil Engineering Department, Ujjain Engineering College Ujjain, M.P., India

Abstract: The demand for multi-storey buildings is increasing day by day. Residential plus commercial building is mainly used for wide span needs. Wide span required for Flat slab, Waffle slab and ribbed slab stands An excellent option for architects when larger openings in a building need to be covered with as few columns as possible. The use of different types of plates is developing as a new trend and is becoming a major challenge for structural engineers. Therefore, it is necessary to study about its structural behavior. The project is carried out under earthquake zone III under the earthquake analysis of G+9 storey building. For this study, four different types of large span slab structure are modelled in C-shape (Horizontal Setback Building) having 10-stories i.e. G+9 storied buildings with 3.50 meters height for each story is modelled and analysed. The plan area of all four buildings is same i.e. 2859 square meters (49.50 m x 82.50 m) each. These buildings were designed in compliance with the Indian Code of Practices for earthquake resistant design of buildings. Base of the building were fixed. The square sections are used for structural elements. The height of the buildings is considered constant throughout the structure. The buildings are modelled using ETABSvr.2016. Keywords: large span slab, ETABSvr.2016, Horizontal Setback Building, Flat slab, Waffle slab and ribbed slab

I. INTRODUCTION I

Horizontal setback buildings are prone to suffer significant damage during seismic excitation due to in-plane soil flexibility, which affects performance in two ways: the first one is change the lateral force distribution between the lateral load-bearing members; and second one is causes excessive stress concentration at the re entrant corners. Recoil structures are highly susceptible during earthquakes due to their vertical geometric and mass irregularity, but the fragility is further increased if the structures also have stiffness irregularities. If the structure is on a sloping ground, the risk factor of this structure may increase. In this paper, the seismic performances of regression structures sitting on flat ground as well as on the slope of a hill with a soft storey configuration were evaluated. The analysis was carried out in three different methods, namely the equivalent static force method, the response spectrum method and the time domain method, and the extreme responses were recorded for the open ground storey inverted building. To reduce this soft fold effect and overreactions, three different reduction techniques were adopted and the best solution from these three techniques was presented. The horizontal setback building consist is also enhance the effect of the building under various types of slabs are used. The Slabs are constructed to provide flat surfaces, usually horizontal in building floors, roofs, bridges, and other types of structures. The slab may be supported by walls or by reinforced concrete beams usually cast monolithically with the slab or by structural steel beams or by columns, or by the ground. The basically slabs are used as normal, waffle, ribbed and waffle slab.

II. OBJECTIVES OF THE PROJECT

The following objectives are taken in this project

1) To study the behavior of different types of slab & secondary beam in a structure. 2) To Study the various past research based on use of various slabs and secondary beam.. 3) To Modelled a G+9 multistory building under taking different variation on slabs & introduce a secondary beam in the structure. 4) To compare a different models case to find optimized structure. 5) To analysis G+9 multistory building by RSA (Response Spectrum Analysis). 6) To assist the different parametric result such as Storey displacement, base shear, overturning moments, storey shears etc into it.